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you need to ask your doctor to issue you a letter on his/her (hospital/ clinic) letter head
and if you want to write your own for proof then simply write
here is sample medical certificate written by patient or behalf of him/her
To whom it may concern
Mr/miss ________________ i was suffering from viral fever dengue and due to high grade fever and low platelates count i was at high risk of easy bruising so i was unable to attend school for two weeks
Here is my complete blood counts (CBC/ CP) reports.

sign and date
simply attach a CBC copy with this letter and submit to your school
P.s This is only sample please edit according to your need.
Regards,
Mustafa a Arain

I couldn't find a manual but here is a site with some good info and some more links to info on other sites. Maybe this will help. Sorry I couldn't do better. Konami's site was under construction and not very helpful.

This is the Metal Gear Server problem and looks like konami guys are not doing anything to make it work. I'm checking their server regulary but it's still rubish.

So there's nothing wrong with our systems, hardware or software, looks like we all just picked the wrong game from the shelves after seeing all those involving trailers..All we have to do now is to wait and see if Konami will wake up, and then hopefully we'll meet @ Metal Gear Online

If the kids are not old enough to acquire credit cards then they shouldnt have an online account as it states when setting up your account players must be over the age of 18 i believe this will be the answer you will get from everyone.